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Post Info TOPIC: 1966 L72 427 build


Canadian Poncho Superstar!

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1966 L72 427 build


So I have the 4 bolt block, 858 square port heads, 6223 crank, dimple rods and factory 069 intake. What I have to figure out is what pistons , cam and lifters to go with? Obviously cant go with the factory specs solid lifters and high dome pistons have to be able to drive this thing on todays gas



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Poncho Master!

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Kevin I have had good luck using Speed Pro flat tops giving 9.5-10 to 1 compression using 91 octane fuel.

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Canadian Poncho Superstar!

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Forged pistons for sure Kevin. Much more pricey, but way more forgiving with any detonation. Size them to the deck to get that minimum squish distance. I'm running domes in my 496 with approx. 10.2 :1 and no issues on Shell Nitro, but that's with aluminum heads.

 

 



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


A Poncho Legend!

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ARCADIAN wrote:

Kevin I have had good luck using Speed Pro flat tops giving 9.5-10 to 1 compression using 91 octane fuel.


  I would second that idea, something under 10:00 to 1. And I know I'll get shot down for this but I'll use cast pistons as long as I can buy them. For the kind of driving I do (and you will likely do as well), I think they are a better choice. 



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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles 



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https://www.motortrend.com/how-to/narrowing-your-piston-choices/



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


Canadian Poncho Superstar!

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Ok... for a milder build, Hypers would no doubt be just fine. I overkilled it with my build, such is how these things tend to go.

Would you guys go with a coated skirt?



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


A Poncho Legend!

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I once saw an engine taken apart with about a thousand miles on it. Coated pistons and the coating was pretty much all worn off. It was barely visible. Maybe that is an exception, I don't know but I haven't forgotten that. Not only was it gone but I hate the idea of anything but oil floating around in the oiling system.

With that said, I'm an uncertified back yard mechanic so don't take my input as scientific!

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles 



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What about weight of pistons? Since Im using a 6223 crank and not a 7115



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A Poncho Legend!

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70 SS ACADIAN wrote:

What about weight of pistons? Since Im using a 6223 crank and not a 7115


 When I asked this question the more answers I got, the more homework I did, the more confused I got....

 



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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles 



Poncho Master!

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I wouldn't worry about it Kevin, unless of course you plan on 24 hour endurance racing with it when finished.

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Stony Mountain, MB

65 Impala SS 2dr HT
65 Impala convert.
59 Impala 2dr HT
67 Acadian Canso 2dr HT

 

 

 

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